--- src/sys/i386/include/Attic/atomic.h	2005/05/25 01:44:12	1.11
+++ src/sys/i386/include/Attic/atomic.h	2005/05/25 22:59:20	1.12
@@ -169,6 +169,8 @@ atomic_poll_release_int(volatile u_int *
  *	bit 0-30	interrupt handler disabled bits (counter)
  *	bit 31		interrupt handler currently running bit (1 = run)
  *
+ * atomic_intr_cond_try(P)	Attempt to set bit 31.  Returns non-zero
+ *				on success, 0 on failure.
  *
  * atomic_intr_cond_enter(P, func, arg)
  *				Increment the request counter and attempt to
@@ -273,6 +275,17 @@ atomic_intr_cond_enter(atomic_intr_t *p,
 }
 
 static __inline
+int
+atomic_intr_cond_try(atomic_intr_t *p)
+{
+ 	int data;
+
+	__asm __volatile(MPLOCKED "btsl $31,%1; setnc %%al; andl $255,%%eax" 
+			 : "=a"(data) : "m"(*p));
+	return(data);
+}
+
+static __inline
 void
 atomic_intr_cond_exit(atomic_intr_t *p, void (*func)(void *), void *arg)
 {